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Labor Day Putting down your wrenches or time for
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2017 Posts: 53 'Bolter | | 'Bolter Joined: Mar 2017 Posts: 53 | I have a 49 GMC pick up with 6 lug GM Rally Wheels with a ZC code. They were with the truck when I bought it as a stalled project. I think they mabe from a 80's Blazer, but not sure. I'm getting a bit of wheel rub on the outer edge of the fender when I hit a bump. I need to replace the wheels with a different offset. I don't know what to look for as I don't have and can't find a code chart that lists the ZC code so I can determine what I have.
Does anyone have a chart or can you direct me to one. I've contacted a local tire shop but they haven't replied yet. I'd like to determine what the ZC code represents as well as determine what code to look for as the replacement.
If interested there are pictures of the truck (as well as my other 2 projects) on my Facepage Tom Strojinc. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | A measuring device does not require codes.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Mar 2017 Posts: 53 'Bolter | | 'Bolter Joined: Mar 2017 Posts: 53 | I understand I can measure my wheels if I take them off, but that doesn't help me with determining what wheel code I should be looking for. | | | | | Joined: Sep 2010 Posts: 2,306 'Bolter | | 'Bolter Joined: Sep 2010 Posts: 2,306 | Just a thought maybe not the wheel ,could it be front end lowered or spring sagging ? | | | | | Joined: Dec 2014 Posts: 678 'Bolter | | 'Bolter Joined: Dec 2014 Posts: 678 | Or maybe just switch to a smaller tire to prevent rubbing? It would sure be faster, cheaper and easier than switching wheels.
And your truck looks great with those wheels BTW.
1951 Chevy Panel Truck
| | | | | Joined: Mar 2017 Posts: 53 'Bolter | | 'Bolter Joined: Mar 2017 Posts: 53 | Sorry, should have stated, its the rear wheels. and thanks for the compliment on the look. I want to keep the rally wheels, just with a different offset. | | | | | Joined: Jul 2000 Posts: 2,187 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,187 | Try asking Wheel Vintiques. I believe they can build you some rally wheels with the offset you want. They might even know what a "ZC" code is.
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
| | | | | Joined: Mar 2017 Posts: 53 'Bolter | | 'Bolter Joined: Mar 2017 Posts: 53 | Thanks for the lead, I just sent and email to Wheel Vintiques. I'll update this post when they get back to me. | | |
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